675

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Across
  1. 3. Solid without long-range order
  2. 5. Compound existing in multiple crystal forms
  3. 7. Vertical column of elements
  4. 12. Mixture of metals
  5. 13. Lacking regular atomic arrangement
  6. 15. Strong permanent magnetic material
  7. 17. Element in f-block, atomic numbers 89–103
  8. 18. Solid with repeating atomic structure
  9. 20. Smallest repeating part of crystal lattice
  10. 21. Arrangement of atoms in solid
  11. 22. Regular three-dimensional atomic array
  12. 24. Element in f-block, atomic numbers 57–71
Down
  1. 1. Different structural form of same element
  2. 2. Solid with ordered atomic pattern
  3. 4. Number of atoms touching a central atom
  4. 5. Horizontal row of elements
  5. 6. Substance with unpaired electrons
  6. 8. Repeating patterns in periodic table
  7. 9. Compound of distinct metal atoms
  8. 10. Metal with variable oxidation states
  9. 11. Predictable property change across a period
  10. 14. Substance with all electrons paired
  11. 16. Net positive charge felt by valence electrons
  12. 19. Energy released when ionic solid forms
  13. 23. Size of an ion in a crystal lattice